Moving LAG from one switch to another, hopefully w/o downtime 1

[DrB0b]

Hello all,
Another quick question for you all. So I have two switches. Switch one has ports 25, 26, 27 set up in a LAG and they are trunking data to switch 2. I am replacing switch 2 with a bigger one with more ports. Am I able to walk the LAG cables over one at a time without issue or will that cause confusion on the LAN on how data should actually get to switch 1?
I have completed moving a LAG in the past but I just unplugged all three trunk lines at the same time and moved it to the new switch, resulting in 10 seconds of downtime. Was just curious if there was a way to do it without any downtime.

Thanks!

Learning - A never ending quest for knowledge usually attained by being thrown in a situation and told to fix it NOW.

 

[ADB100]

If you have spare ports on switch 1 (or even one spare port) then you should be able to achieve this.
Set up a new port-channel on switch 1 and the new switch
Assign the physical ports to the channel (if you have only one free on switch 1 then just assign that one)
Physically cable them together
You will now have three switches connected and you should be able to migrate the hosts from switch 2 to the new switch
When that's done you can remove the physical interfaces from the original port-channel (physically as well as via configuration)
Assign them to the new port-channel and cable them up

You shouldn't experience any down time.

Andy

 

[DrB0b]

Ok I think I see what you are saying but this would require three switches in play and not just the two, the one you are replacing the new one, correct?

I did try playing around with doing it with just the two switches and one of the switches freaks out when there are multiple paths to it, which I guess is to be expected. Thanks for giving me a good idea and I can use my backup switch to achieve this. Have a great day!

Learning - A never ending quest for knowledge usually attained by being thrown in a situation and told to fix it NOW.